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INTERNAL COMBUSTION ENGINE WITH DUAL SWIRL INTAKE

Abstract(summary):

In order to extent the operation range of an internal combustion engine, i.e. the operation range of a HCCI engine, or to increase the compression ratio of a spark ignition engine (Otto engine) the invention proposes generating a dual swirl in the cylinder. According to the invention the strength of the dual swirl is variable and adjustable or feedback controllable. For the HCCI combustion mode the stratification of the temperature field is adjustable by the strength of the dual swirl flow motion which allows extending the operation towards higher engine loads. In addition, the dual swirl prevents the mixing of the gases in the two intake channels, which can be used to generate stratified mixtures without employing a direct injection system. This can be used for extending the HCCI operation range towards lower loads. In case of spark ignition engines the dual swirl can generate a more homogeneous temperature distribution allowing higher compression ratios and thus higher engine efficiencies.


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